I have had my diamond watchman sand sifting goby for about 3 years now. He has always been a good eater and had a big belly. I have noticed that he is not very interested in food and when it takes it in it will come right back out of his gills just like the rocks when he sifts. He is now skinny. It took me a while to notice that he was losing weight because he always hide in his tunnels. I noticed he was acting weird because he was not hiding and was very easy to catch.. I have in in a breeding tank that is hanging in the tank he is normally in hoping to target feed him to beef him back up. I feed him pellets usually but have put him back on mysis shrimp to help beef him up. I also bought krill in hopes that there will be more protein for him. Any recommendations?